/Engine/Plugins/Runtime/GeometryProcessing/Source/GeometryAlgorithms/Public/Arrangement2d.h
Attempts to triangulate the arrangement with a constrained Delaunay triangulation NOTE: May fail if arrangement has self-intersections
false if triangulation algo knows it failed; will still likely have some triangulation even in this case
bool TriangulateWithBoundaryAndHoles ( [TArray](API\Runtime\Core\Containers\TArray)< [FIndex3i](API\Runtime\GeometryCore\FIndex3i) > & Triangles, int32 BoundaryEdgeGroupID, int32 HoleEdgeGroupID )